Chinese scientists realize high -sensitivity measurement high -frequency microwave

A few days ago, Du Jiangfeng, Shi Development, Kong Fei and others made important progress in the field of microwave magnetic field measurement in the Micro Magnetic Resonance Key Laboratory of the Chinese Academy of Sciences of China. Magnetic field measurement, compared to the Ayoutesra indicator level, which was realized before, the measurement sensitivity increased by nearly 100,000 times. Related research results were published in "Scientific Progress".

Microwaves are everywhere in human life and scientific research. In daily life, the electromagnetic waves used by mobile communication belong to the category of microwave, and the development of microwave measurement technology has important value for the development of wireless communication. In scientific research, the high -sensitivity measurement of high -frequency microwaves can provide basic support for high -frequency high -frequency magnetic resonance spectrum, Taihez imaging, and even astronomical observation.

The use of quantum sensing technology that is innovative in principle can greatly enhance the sensitivity of microwave measurement, which has been widely researched and developed in the past ten years. At present, common quantum sensors include Rideburg atoms, atomic magnetometers, superconductant quantum interference meters, and diamond NV color hearts. Among them, the NV color heart system has become a solid quantum sensor with a promising prospect because of its unique carrier stability and room temperature atmospheric environmental compatibility, and improving detection sensitivity is one of the most important development directions.

The most direct way to enhance sensitivity is to use a large number of NV color to carry out parallel measurement. Because the size of a single NV color is only atomic, even diamonds of the size of millimeter -level chips can integrate hundreds of millions of NV color hearts. However, as the size increases, the quantum regulation of all NV color is more difficult.

Therefore, the researchers proposed a measurement that does not require complex quantum regulation to greatly improve the utilization rate of NV color heart in diamond. The basic principle is that the NV color will continue to generate fluorescence under the continuous stimulation of laser heart. When there is a weak microwave in the space that has the resonance with the NV color heart -level resonance, the fluorescent brightness will decrease. In other words, when the microwave is weak, the response of fluorescence is extremely weak.

In order to enhance the response of NV color heart to microwave, the research team borrowed the ideas of traditional foreign negative measurement, and proposed a continuous microwave detection method: Introduce a slightly stronger microwave and tested microwave interference, generating frequent oscillating, corresponding NV, corresponding NV The fluorescence will also generate frequency oscillations, and its amplitude is proportional to the amplitude of the microwave to be tested, which is equivalent to "enlarging" the microwave to the microwave with auxiliary microwave.

Using this method, the research team successfully achieved a microwave magnetic field measurement of the unit time of 8.9 Pittesla, which contains 2.8*1013 NV -colored quantum sensors. Tesla's index level, the measurement sensitivity increased by nearly 100,000 times.

This method avoids complex synchronous quantum control, which can be directly promoted to the larger diamond quantum sensor that contains more NV color hearts. In the future, it is expected to further increase the measurement sensitivity to 0.1 Pittusla's horizontal level or even higher. Due to the saving hardware device with quantum control, this scheme laid the foundation for miniaturization and chipization of diamond quantum sensing system. At the same time, it has also taken an important step towards the practicality of King Kong quantum sensors in wireless communication and magnetic resonance testing. (Guangming Daily)

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